Believe it or not, nobody knows for sure the true height of the world’s tallest peak, Mount Everest.

It was generally thought to be 29,028 feet high after it was measured by an Indian survey in 1954. But China says the world’s highest mountain (which it calls Zhūmùlǎngmǎ Fēng) is only 29,015 feet — China’s . . . → Read More: Mt. Everest height disputed